Drying or condensing apparatus.



M. TPPBR.

DRYING OR GONDENSING APPARATUS.

APPLICATION FILED 00T. 16, 1909.

Patented Apr.5,1-91o.

inver/'707 953,807.1-fA a i Appncation fue@ october 1e, 190s. serial No. sea-ee?.

1o all ,fw/ioniA it filari/ concern:

Beit known that I, MaxfTrrni-r, a subject of tlieKingof Saxony, residing at Rittergrut Grosszschocher, near Leipzig, in Germany, have invented certain new and useful Improvements in Drying or Condensing A pparatus, ofwhich 'the following' is a vspecificationz,

"This-.invention relates toapparatus for condensings,- and ,drying milk and other mixtures offliquidsa'nd solids, and object is separately heatthe separated milk and the cream, or. `only .one of thesel constituents, the tw-o, cons titufentsbeing then mixed again,

jg'and-ftheevaporation completed. This enablestheinilk tofbeftreated at a higher temperatnrethanthe more sensitive cream, but the final product obtained isv not of uniform solubility, appearance, I and flavor, T his Waszdue either' ltorthe fact thatv the milkintenselyand layers. v,were subje'cted to too intense one-l 'sidedheating, wfhilef the air acted unfavorably .onl the ,other side, orv that themilk, treatedin ag cio edchamber, was heated too i iddenly en both sides, so that ied, These disadvantages it was, in part bn are obviated bv-th'e present invention.

In the im,l edap'paratus a` layer of the liquid-inassQoi offene of they constituents thereof, forexaniple skim-milk, is first dried on one side, bypassing over a heated revolving drum, and is then turned and passed ontol anbtherlieaiting drum revolving in the opposite direction. The second drum may already have upon it a layer of another mass, for examplelcream. The exposed surface of the layer is acted on, during the drying operation, by a stream of gas, for example purilied, dry air, or air from which oxygen has been separated, the gas being hot or cold according to requirements. The treatment takes place in a' dark chamber, from which the atmosphere is excluded, and in which a pressure above atmospheric. pressure can be maintained.

A construction embodying the invention is shown in the accompany'ing drawing, which is a sectional elevation of the apparatus. i

n l. l f ,Darme en o ormiinsria'o-f4 Aiilaiirfns Specificatie@ Leegte-aat'.

i i l i l r i Tonnen, on nirrrnneufr vc-rtorssaso-rocringe'.` y terrine. erariali-.anni i sion e substantially parallelfwlithia portion of the surface of' theedrum If. Another vscraper f is arranged adjaentthe drum b in the mouth of a discharging duct which traverses the wall of the casing.'-

In the treatment of vmilk which has' been' separated into skini-milkplan'dl cream,-the skim-milk is introduced' into'- the casing through a ductg, whence itdrop'sintoa pan Z in or formed by the betteln of thev casing` a thin layer -oriilm being .taken'up by the drum a. Instead of this `arrangement a distributer may be used for applying 'the layerto the d1-urn.v Atthe same Atime a llayer of cream is applied to the drum 'ZJ by meansof a distributer gc. If only'one mass ius-to be treated the distributeia,I vmay be 'dispensed with.

' Streams of air through pipes L and z', which direct the air are admitted to the casing on to the drums a and b'respectively. lThe perature is preferably kept below thepfoint at which albumen becomes insoluble..lr 'Ihe temperature of the cream-drum is 4kept below the point at which the fatis deleteriously affected.

In the treatment of skim-milk and cream the heat of the drum a acts directly on the inner surface of the applied layer of skimmilk while the stream of air directed against the drum carries away the vapor generated. The air and Vapor leave the casingl at 7c, if necessary or desirable, suction may be applied at 7c to accelerate the removal. Then the layer of condensed skim-milk, already nearly dry, reaches the scraper Z it is lifted fromthe drum and deflected by the guide e In the drawing c represents the closed i on to the drum Z2, the direction of rotation A of Which'is opposed to that of the drum a.

By its deflection at d e it is turned and laid upon the layer of moist cream on the drum b. -The skim-milk layer absorbs misture from the cream, and the fat-globules assists indrying the cream, the drying of both layers beingcompleted by the drum l), whereupon the combined vlayers are scraped off the drum by the scraper f and passV through the discharge-duct out of the casing. The temperatures used may be so regu' lated as to produce, as final product, either a 'pasty mass or a mass which can be readily pulverized. For the latter purpose the cream-drum. is heated to vthe highest admissible temperatur, and the condensed skimmilk is applied to the cream-layer in the form4 of a strongly coherent layer. l For producing a pasty mass the cream-drum is heated very slightly, or not at all, and the layer of condensed skim-milkis applied as before Vand then quickly' removed. The pasty mass produced is more suitable than milk-powder for some purposes, for example for use in the manufacture of chocolate, and

much more durable.

For treating a single mass, both the drums are, in general, heated to the 'same temperature. The mass introduced at, g istaken up by the drum a, partly dried thereon,l scraped off and deflected at d e, and directly applied to the surface of the drum b, by the heat of which the drying is completed.

The process maybe modified by using the drums at normal temperature, orcooling them, and introducing streams of hot air. The drums may b e side by side instead yof one' bove the other, and skim-milk may be first applied to theupper drum, and cream to the lower. The liquid mass may be sprayed, poured or otherwise applied to the drums. vFor some purposes the entire cas` ing may be artificially heated or cooled. The Scrapers may be of rigid or elastic material.

lVhat I claim as my invention and desire to secure by Letters Patent of the United States is 1i In apparatus for condensing or drying milk and other liquids the combination with an inclosing casing adapted to have' a vacuum created therein, oftwo heater drums revoluble in opposite directions, means for applyin the liquid to the one drum and means for dglrectly transferring the fhn of partially dried liquid from said drum and applying it to the other drum.

2. In apparatus for condensin or drying milk and other liquids, the com ination of two heater surfaces and means for directly transferring the lm of partially dried liquid from the one surface to the other, the surfaces acting in succession on opposite sides of the film.

3. In apparatus for condensin or drying milk and other liquids the com ination of two driuns revoluble in opposite directions, means for -applying the li uid to the one drum and means for-tran erring vthe film of 'partiallydried liquid from said drum and applyin' it to the other drum, together with means or 1applying another Lliquid to the second drum.

4.' In apparatus for condensing or drying milk and other liquids the combination of two drums revoluble in opposite directions, means for applying the liquid to the one drum and means for transferring the film of partially dried liquid from said druml and applying it tothe other drum, together with means or applying another liquid to the second. drum prior to the transference of Vthe said film thereto. l

5. .In apparatus for condensing or drying milk and other liquids the combination of two drums'revoluble'in opposite directions, means for. applying the li uid to' the one drum and means for trans erring the film of partiallydried liquid from said drum and applying it to the other drum, together with nie-ans. for applying another liquid to the second drum and means :for heating the drums to different temperatures.

In Witness whereof I have signed this specication in the presence of two Witnesses.

MAX TPFER.

lllitnesses RUDOLPH Fnionn, SOUTHARD P. IVARNER. 

